Galileo's Pendulum

‘Tis the New Year (in the Gregorian calendar, at least)! Over the weekend, the twin GRAIL satellites entered orbit around Earth’s Moon, and I may yet have something to write about that very cool mission, but first I want to highlight the largest Saturnian moon: Titan. (Other Moonday posts cover Hyperion, Enceladus, Io, Europa, and…